Patent US4716736A successfully refreshed from Google Patents.
US4716736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal assisted carbon cold storage of hydrogen
Assignee: Syracuse University
•
Filing: 1986-01-17
•
Granted: 1988-01-05
•
Expires: 2006-01-17
Abstract
Abstract Hydrogen is stored at cold temperatures (room temperature to liquid nitrogen temperature) by sorption in a high unit surface area activated carbon storage medium. A minor amount of a transition metal is dispersed in the carbon, and this significantly increases the hydrogen occupancy of the available storage sites on the carbon. In a favorable embodiment, the storage medium is activated so as to maintain a quantity of water, which acts as a co-catalyst to further enhance the quantity of hydrogen that can be stored.
Inventors
- 👤 James A. Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:32
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/0005; C01B3/001; C01B3/0078; F; F17; F17C; F17C11/00; F17C11/005; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/32
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
85 words
A method of storing hydrogen by sorption on a composite formed of carbon and a transition metal, comprising the steps of contacting gaseous hydrogen with a storage medium formed of high surface area activated carbon combined with an active transition metal in elemental form capable of dissociating the hydrogen, physisorbing the hydrogen on the storage medium, and storing the sorbed hydrogen by maintaining the pressure at or above one bar and maintaining the temperature of the medium in a cold temperature range below 293 K.
Claim 2
Independent Claim
85 words
A method of storing hydrogen by sorption on a composite formed of carbon and a transition metal, comprising the steps of contacting gaseous hydrogen with a storage medium formed of high surface area activated carbon combined with an active transition metal in elemental form capable of dissociating the hydrogen, physisorbing the hydrogen on the storage medium, and storing the sorbed hydrogen by maintaining the pressure at or above one bar and maintaining the temperature of the medium in a cold temperature range below 293 K.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said transition metal is dispersed in said carbon as small particles in the size range of about 50-200 Å.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said transition metal is selected from group VIII transition metals.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein said transition metal is selected from the family consisting of Ni, Pd, and Pt.
Claim 6
Dependent Claim
20 words
The method of claim 3 wherein said transition metal is selected from the family consisting of Co, Rh, and Ir.
Claim 7
Dependent Claim
20 words
The method of claim 3 wherein said transition metal is selected from the family consisting of Fe, Ru, and Os.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein said storage medium consists of activated carbon and 5% by weight of said transition metal.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein said activated carbon has a surface area factor of at least 1000 m 2 /g.
Claim 10
Dependent Claim
29 words
The method of claim 1, further comprising preparing the storage medium prior to said contacting with hydrogen, by flowing an inert gas through said medium for dehydrating the same.
Claim 11
Dependent Claim
52 words
The method of claim 9 wherein said preparing includes flowing hydrogen for a period of time at about 373 K., then flowing said inert gas over said medium for an additional period of time at about 373 K., and then cooling the storage medium to a temperature in said cold temperature range.
Claim 12
Dependent Claim
22 words
The method of claim 1 wherein said maintaining the temperature in the cold temperature range includes cooling said medium with liquid nitrogen.
Claim 13
Dependent Claim
18 words
The method of claim 1 wherein said high surface area activated carbon has a pH that is basic.
Claim 14
Dependent Claim
17 words
The method of claim 12 wherein said carbon has a pH of between about 9 and 10.
Claim 15
Dependent Claim
21 words
The method of claim 1 wherein said maintaining the pressure is carried out for a charging interval of about four hours.
Claim 16
Dependent Claim
14 words
The method of claim 14 wherein said pressure is maintained at about 40 bars.
Claim 17
Dependent Claim
14 words
The method of claim 1 wherein said pressure is maintained below about 50 bars.
Claim 18
Dependent Claim
15 words
The method of claim 16 wherein said pressure is maintained between one and twelve bars.
Claim 19
Dependent Claim
14 words
The method of claim 17 wherein said pressure is maintained at about one atmosphere.
Claim 20
Dependent Claim
65 words
Storage apparatus for storing hydrogen in sorbed form, a comprising a pressure vessel having a port for receiving and discharging the hydrogen; cooling means for maintaining said vessel at a temperature in a cold temperature range; and a fill of a storage medium that consists of high surface area activated carbon combined with an active transition metal in elemental form capable of dissociating the hydrogen.
Claim 21
Dependent Claim
65 words
Storage apparatus for storing hydrogen in sorbed form, a comprising a pressure vessel having a port for receiving and discharging the hydrogen; cooling means for maintaining said vessel at a temperature in a cold temperature range; and a fill of a storage medium that consists of high surface area activated carbon combined with an active transition metal in elemental form capable of dissociating the hydrogen.
Claim 22
Dependent Claim
22 words
The storage apparatus of claim 19, wherein said pressure vessel is capable of sustaining a pressure of at least about 100 atmospheres.
Claim 23
Dependent Claim
23 words
The storage apparatus of claim 19, wherein said cooling means includes means for cooling said storage medium to or near liquid nitrogen temperatures.
Claim 24
Dependent Claim
20 words
The storage apparatus of claim 19, wherein said transition metal is a metal selected from the group VIII transition metals.
Claim 25
Dependent Claim
21 words
The storage apparatus of claim 19, wherein said transition metal is selected from the family consisting of Ni, Pd, and Pt.
Claim 26
Dependent Claim
21 words
The storage apparatus of claim 19, wherein said transition metal is selected from the family consisting of Co, Rh, and Ir.
Claim 27
Dependent Claim
21 words
The storage apparatus of claim 19, wherein said transition metal is selected from the family consisting of Fe, Ru, and Os.
Claim 28
Dependent Claim
22 words
The storage apparatus of claim 19 wherein said storage medium consists of activated carbon and 5% by weight of said transition metal.
Claim 29
Dependent Claim
23 words
The storage apparatus of claim 19 wherein said activated carbon has a surface area factor of at least about 1000 m 2 /g.
Claim 30
Dependent Claim
15 words
The storage apparatus of claim 27 wherein said pH is between about 9 and 10.
Claim 31
Dependent Claim
16 words
The storage apparatus of claim 19 wherein said activated carbon has a pH that is basic.
References Cited (Backward Citations)
US3300992A
Cited
US4375257A
Cited
US3732690A
Cited
US4165569A
Cited
US4249654A
Cited
US4433063A
Cited
US4489564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |